PROGRESSIVE DEVELOPMENTS IN THE DESIGN OF AN AIRBORNE UHF TRANSMITTER FOR THE FALLING SPHERE EXPERIMENT.
UTAH UNIV SALT LAKE CITY UPPER AIR RESEARCH LABS
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In this report the development of a pulsed telemetry transmitter to be incorporated into a 7 inch sphere con taining instrumentation to measure high altitude air density is discussed. A 20 watt, 730 mc tube type pulse transmitter is described. Construction details and checkout procedure are also included. The theory and design criterion of a 30 watt pulse modulated transmitter using ceramic planar triode tubes with coaxial resonators is also presented. The final section suggests the development of a transistorized, frequency modulated transmitter operating at 400 mc. A simple method of obtaining the frequency modulation is developed along with suggested circuits and their power gains for the remaining sections of the transmitter. The power output is conservatively estimated at 825 mw. Author